Sliding vane engine or pump



w. 5, ma. A. c. BRADFORD Q SLIDING VANE ENGINE OR PUMP Filed Nov. 9, 1945 Patented Nov. 5, i946 This invention relates to a rotary pump or engine, and has for the primary object the provision of a device of this character which will be extremely efficient and consists of a minimum number of parts, such as a stator and a rotor including a slidable abutment or gate of an improved construction to assure against leakage between the rotor and stator and still maintain friction therebetween reduced to a minimum.

With these and other objects in view as will become more apparent as the description proceeds, the invention consists in certain novel fea tures of construction, combination and arrangement of parts as will be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure 1 is a side elevation illustrating a pump or engine constructed in accordance with my invention.

Figure 2 is a transverse sectional view illustrating the stator and rotor, the latter including the improved construction of abutment or gate.

Figure 3 is a vertical sectional view illustrating the device c Figure 4 is a side elevation illustrating the abutment or gate.

Figure 5 is an edge elevation illustrating the gate or abutment.

Referring in detail to the drawing, the numeral 5 indicates a stator including an annular body 5 in which is'formed. a chamber 1 of substantially elliptical shape. The stator 5 further includes removable end walls or heads 8- provided with internal recesses 9 arranged in opposed relation and eccentrically of the chamber l and which provides seats for rotatably supporting a rotor Ill having wiping contact at one point with the internal wall of the body 6 of the stator 5 and between inlet and outlet ports designated generally by the characters 10 and l l.

A shaft 12 is integral with one end of the rotor l and extends through an opening #3 provided in one of the heads or end walls 8. A stufilng gland It is provided between said last-named head or end wall and the shaft I? to prevent leakageabout the shaft.

The rotor l0 includes a cylindrical body l provided with an elongated slot l6 extending therethrough to slidably receive an abutment or gate ll substantially rectangular shaped, the edges of which are provided with substantially v shaped grooves 58 to accommodate packing l9 adapted to have wiping contact with the Wall of 2 the body's of the stator as well as with the heads or end walls 8 to prevent leakage between the ate or'abutment and the stator.

The packing i9 is substantially triangular shaped in cross section so as to tightly fit the V-shaped grooves and protrudes a limited distance beyond said grooves to have the stated W11)- ing contact with the stator. The packing i9 is made up from aplurality of L-shaped strips, the ends of which are cut on an angle so that when the strips are assembled in the grooves of the abutment or gate the ends of the strips will overlap, as shown at 20, effecting an efficient seal between connecting or adjacent strips of the packmg.

Thelrotor rotateswithin the stator and during its rotation the gate. or abutment is free toslide relative thereto. so that the packing thereof will maintain a wiping contact with the interior walls of the statorand it will be seen that during the rotation of the rotor any fluid which may be within the chamber I will be forced therefrom by the abutment or gate when the latter passes beyond the outlet port and that fluid will be taken into the chamber 1 as the abutment or gate moves away from the inlet port l6,-thereby permitting the fluid to be efficiently circulated by the device if the device is used as a pump and if used as a compressor or engine substantially the same operations occur,

While I have shown and described the pre ferred embodiment of my invention, it will be understood that minor changes in construction, combination and arrangement'of parts may be made without departing from the spirit and scope of the invention as claimed.

Having thus described my invention, what I claim is:

1. In a pump, a stator having inlet and outlet ports and forming a chamber of elliptical section having their adjacent ends beveled for overlapping, all of said edges of the rectangular plate having grooves formed therein and the beveled overlapping ends of said. packing strips bein'g disposed in the intermediate part of each of said edges, so that the packing strip portions on the opposite side edges of the plate are disposed in 2. In a pump or the like, a stator having inlet and outlet ports and forming a chamber of elllptical section and having opposite end walls and a curved side wall, a rotor eccentrically journaled in said chamber and having contact with the curved side wall of the stator between said ports and provided with a slot having opposite end walls each flush with an end wall of the stator, a substantially rectangular plate slidable in said slot and having grooves in its edges and coacting with the interior of the chamber and including a pair of opposite edges; each of which passes over said parts in succession and forming expanding and contracting fluid pumping spaces,

'and a packing mounted within eachof said grooves, said packing taking the form or substantially L-shaped strips having their adjacent ends beveled to overlap one another and being so ar 4 i ranged within the groovethat the beveled overlapping ends lie within the portion of said groove intermediate the walls thereof and the opposed ends fit about the complemental edges or said roove.

3.- In a pump, a stator having inlet and outlet ports and iorming a chamber of elliptical section and having opposite end walls and a curved side wall, a rotor eccentrically Journaled in the chamber and having contact with the stator between sai ports and provided with a slot, a substantialhr rectangular plate slidable in said rotor slot and having V-shaped grooves in its edges and coactlng with the walls of the pump chamber and including opposite edges each of which passes over said ports in succession, said plate forming expanding and contracting fluid spaces, and a packing mounted within each of said grooves, saidpacking taking the form of substantially L- shaped strips having their adjacent ends beveled to overlap one another and of a cross-section conforming to a groove of said plate. I

AARON C. BRADFORD. 

